Sennheiser XSW IEM EK A-Band, Wireless UHF In-Ear Receiver, Frequency range A-band: 476 - 500 MHz, Transmitting power: 30 mW, Transmission range: 45 - 15,000 Hz, Switching bandwidth up to 24 MHz, EQ, Limiter, Frequency Presets, Focus Mode, Infrared Sync, Operating time: approx. 6 hours - depending on the volume setting, 3.5 mm Mini jack headphone output, Dimensions (W x D x H): 95 x 70 x 26 mm, Weight: 110 g, Incl. Sennheiser IE 4 in-ear earphones and 2x AA batteries